9. Do Crunches Using an Exercise Ball

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Crunches are a great way to shape up your abs. Sit on your exercise ball resting your lower back on the ball and placing your feet on the floor and place hands behind your head. Do crunches up and back while keeping your lower back on the ball. Why are these crunches better for getting great abs? Because, to stay on the ball, you’ll have to use your core for balance, kicking your crunches up a notch.

Try Some Old-school Sit-ups
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